The town is known to be part of the so-called "Lombard communes" of Sicily, whose dialect (belonging to the so-called "cock-Sicilian") has little to do with the indigenous languages, and much to do with those of the northern Piedmont regions, especially areas of Monferrato.
The fact can be explained historically to have been destroyed the old town square - built by the Norman King Roger II of Sicily on a previous settlement greek-roman (perhaps Stalls / Pluto) - by King William I of Sicily in order to punish his rebellion led by Roger Sclavo, the illegitimate son of Count Simon Aleramo, which in practice had murdered the Arab population.
Later it was rebuilt higher up the hill by William II Armerino and repopulated with people from the areas "Lombard" northern.
The dialect has been studied among others by Remigio Roccella he proceeded to compile a vocabulary of spoken language in Piazza Armerina, but you may also remember the contributions of Litterio Villari.
About Piedmont origins (indeed "Monferrato") may be formed not of Piazza Armerina
only the use of the Gallo-Sicilian dialect with other historical variously confirmed, but also some anecdotal analogy between a lemma which talk about it and the legend that on the etymology of the name Monferrato (in the Piedmont "mònfrà"), tells how in 961 , the then Earl Aleramo would ride his horse with a whole day to delineate the boundaries of the future of his estate (which will become Marquis) which would receive a prize from The Brass for his services. On that day it seems that the horse lost a shoe Aleramo and the knight, having nothing better to remedy, he used then and there, a brick found on the ground and with it tied to his horse's hoof, in the manner of shoeing in order to resume his journey. In Piedmont the brick is usually called "world" and from there to "mònfrà" (shod with brick) and then "Monferrato", the step would be soon! But there would be more; fact is that the origins of a particular Sicilian etymology indicates that the brick are the exclusive prerogative of Piazza Armerina and its surroundings: in those places the brick building is commonly called a "zucculettu" which, translated into Italian, may sound more or less as "small base" here is the hoof of the horse returned Aleramo and, somehow, re-confirm the origins of Piazza Armerina Piedmont.